Mars Exploration Rover

Articulated, snap together, Mars Rover! No screws, glue, or support structure needed (although some glue in a few places wouldn't hurt). All the parts can be posed, turned, twisted. The wheels turn and the legs even pivot like the real thing to go over obstacles! Unfortunately, it is not autonomous.

http://en.wikipedia.org/wiki/Mars_Exploration_Rover

2011-07-19 Update: V3 fixes a problem with plate 5 that was causing some pieces to be too close together and get merged, makes the axel holes in the body a little tighter, half the panels in the plates have been flipped so that the shiny side of all pieces printed on a HBP can be on top, I made the dimples on the panel tabs larger so they hold together better, and I also added squares to the panels to make them look more like solar panels.

2011-07-16 Update: I uploaded a new version of everything with a few changes like dimpled tabs for the solar panels (thanks to gpvillamil) and slightly larger holes to make it easier to snap